Hi Richard, great idea.
I've made a list of suppliers for my 1976 S100 restauration & keeping my '98 Felicia roadworthy. Maybe I'll make a thread about the resto one day.
Skoda-parts is a great store, fast and cheap delivery.
Note: these are sometimes links to certain items I saved, you can click to the homepage from there.
https://www.osttimer.de/Eshop/?cz_1000mb-s-100-s-110,70
motorenparts.com
https://www.for-veteran.eu/Brzdy-c1_11_2.htm
https://www.skodaveteran.com/podvozek/
https://www.skoldtimer.de/p/wasserrohr-der-heizung-1000mb-s100-110r
https://www.skoda-parts.com
https://speedpro.eu/
https://www.skopart24.com/
https://www.sp-el.cz/SPAX-Sportovni-pruziny-35mm-Skoda-1000-MB-1100-MB-100-105-110-120-130-d985.htm
Sometimes I do order on "the cardoctor app", just need to make sure you get the 'safe order' because parts may not fit. I sometimes also order parts for later models (favorit or estelle) which seem to fit by comparing photo's.
Kind regards